Misc - MIYAMOTO Shinichi

A Study on Channel Assignment in 2.4GHz-band Wireless LAN System

LEE Atsushi, MIYAMOTO Shinichi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers )  2001 ( 1 ) 681 - 681   2001.03

A Study on the Performance of TDMA Indoor Infrared Wireless Communication System with Space Division Zone Construction

KOBAYASHI Junichi, MIYAMOTO Shinichi, HIROHASHI Kazutoshi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers )    703 - 703   2001

A Study on Multiple-beams and Multiple-detectors for PPM/CDMA based Diffuse Indoor Infrared Wireless Communication System

YAMANE Takahiro, MIYAMOTO Shinichi, HIROHASHI Kazutoshi, MORINAGA Norihiko

Technical report of IEICE. RCS ( The Institute of Electronics, Information and Communication Engineers )  100 ( 345 ) 115 - 122   2000.10

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Code division multiple access (CDMA) scheme is a current subject of great interest as a multiple access scheme for indoor infrared wireless communication system. In this paper, we discuss the performance of CDMA based diffuse indoor infrared wireless communication system and propose the multiple-beams transmitter and the multiple-detectors receiver. Numerical results conclude that the improvement in various performance of PPM-CDMA based system are achieved by using the proposed system.

A Study on the Performance of 2.4GHz Band Wireless LAN System using Adaptive Multicode Transmission

WATANABE Kazuhiro, MIYAMOTO Shinichi, MORINAGA Norihiko

Technical report of IEICE. RCS ( The Institute of Electronics, Information and Communication Engineers )  100 ( 278 ) 9 - 14   2000.09

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With the increase of demands for Wireless Local Area Network (WLAN) systems, 2.4GHz band WLAN system has been taking a great attention, as it provides attractive features such as relative high-speed transmission, low cost, and unnecessity of the license. However, it is well known that the performance of conventional 2.4GHz band WLAN systems based on IEEE802.11-1997 and IEEE802.11b standards are seriously degraded by burst noise such as man-made noise emitted from ISM apparatus, and that the maximum transmission rate achieved by 2.4GHz band WLAN system is quite lower than one achieved by Wired LAN. In this paper, we propose a techique to suppress burst noise such as man-made noise in the DS-SS system and to achieve high-speed rate transmission using adaptive mutlicode transmission which changes the number of codes according to propagation condition. Numerical results conclude that performance of transmission rate can be much improved by using the proposed system.

A Study on the CNR Estimation under Man-made Noise and Multipath Fading Environments and Its Application to Improvement of 2.4GHz Band Wireless LAN System with Sector Antenna

TOU Shinpei, MIYAMOTO Shinichi, MORINAGA Norihiko

IEICE technical report. Electromagnetic compatibility ( The Institute of Electronics, Information and Communication Engineers )  100 ( 207 ) 13 - 18   2000.07

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With the increase of demands for Wireless Local Area Network(WLAN) systems, 2.4GHz band WLAN system has been taking a great attention, as it provides the attractive features such as relative high-speed transmission, low cost, and unnecessary of the license. However, the performance of 2.4GHz band WLAN system is seriously degraded by man-made noise emitted from ISM apparatus and multipath fading caused by multipath propagation of transmitted signal. Since radio channel is varied with time under man-made noise and multipath fading environments, it is effective to estimate channel condition for the improvement which adapt to time varying of the channel. In this paper, we focus on Carrier-to-Noise Power Ratio(CNR) as the most basic parameter which characterizes radio channel condition, and evaluate performance of CNR estimation under man-made noise and multipath fading environments. And next, we evaluate the improvement in Bit Error Rate performance of 2.4GHz band WLAN system using sector antenna with CNR estimation.

A Study on CNR Estimation and its Application to Improvement of Performance using Sector Antenna in 2.4GHz Band Wireless LAN System

TOU Shinpei, MIYAMOTO Shinichi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers )  2000 ( 1 ) 622 - 622   2000.03

The Influence of Inverter Fluorescent Lamp in Optical Wireless Communication System

SASAO Takayoshi, MIYAMOTO Shinichi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers )  2000 ( 1 ) 630 - 630   2000.03

A Study on the Path Diversity Technique for PPM/CDMA Non-directed Diffuse Indoor Infrared Wireless Communication System using Multiple-beams and Multiple-detectors

YAMANE Takahiro, MIYAMOTO Shinichi, YAMADA Kiriko, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers )  2000 ( 1 ) 628 - 628   2000.03

A Study on the Performance of 2.4GHz Band Wireless LAN Systems using Adaptive Multicode Transmission under Man-made Noise Enviromnent

WATANABE Kazuhiro, MIYAMOTO Shinichi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers )  2000 ( 1 ) 623 - 623   2000.03

A Study on a Man-made Noise Reduction Technique using Adaptive Array Antenna in 2.4GHz Band Wireless LAN System

MATSUURA Mitsuyasu, MIYAMOTO Shinichi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers )  2000 ( 1 ) 320 - 320   2000.03

A Study on the Performance of Indoor Infrared Wireless Communication System using PPM/CDMA with Gold Codes

KINOSHITA Takuya, MIYAMOTO Shinichi, HIROHASHI Kazutoshi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers )  2000 ( 1 ) 627 - 627   2000.03

A Study on the Influence of Interference Light for Indoor Infrared Wireless Communication System with Overlapping Zone Construction

MOCHINAGA Kazuhiro, MIYAMOTO Shinichi, SASAO Takayoshi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers )  2000 ( 1 ) 626 - 626   2000.03

A Study of the Reflection from the Wall for the Diffuse Reflection Optical Wireless System

YAMADA Kiriko, SAKAI Masahisa, MIYAMOTO Shinichi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers )    629 - 629   2000

Parameter Estimation and Error Rate Performance of Optimum Receiver under Class-A Impulsive Radio Noise Environment

KANEMOTO Hideki, MIYAMOTO Shinichi, MORINAGA Norihiko

The Transactions of the Institute of Electronics,Information and Communication Engineers B ( The Institute of Electronics, Information and Communication Engineers )  82 ( 12 ) 2364 - 2374   1999.12

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高周波デバイスを用いた電子機器等から発生する人工雑音の多くはガウス雑音とは大きく異なった統計的性質を有するため,人工雑音環境下においてはガウス雑音下での使用を前提として設計された従来の受信機の誤り率特性は大きく劣化することが知られている.そのような人工雑音環境下においても良好な誤り率特性を確保する方法の一つとして,人工雑音環境に対する最適受信機が提案されている.この最適受信機は人工雑音の統計的性質に基づいて最ゆうシンボル判定を行うことにより良好な誤り率特性を達成するものであり,最適受信を行うに際しては人工雑音の統計的性質を事前に推定しておく必要がある.そこで本論文では,人工雑音の統計モデルとして,MiddletonのクラスAインパルス性無線雑音モデルを用い,最適受信を行う際に必要となるクラスAインパルス性無線雑音のパラメータ推定並びに推定結果に基づいてパラメータ設定された最適受信機の誤り率特性について検討を行っている.まず,クラスAインパルス性無線雑音環境下における最適受信について示し,人工雑音のパラメータ推定誤差が最適受信機の誤り率特性に及ぼす影響を評価し,人工雑音環境下において最適受信による特性改善を得るためには,雑音の統計をある程度適切に反映するパラメー夕を用いて最適受信を行う必要があることを明らかにしている.次に,推定に用いる雑音サンプル数とパラメータ推定の精度について検討し,高精度なパラメータ推定を行うには膨大な雑音サンプルを必要とするものの,ある程度の雑音サンプル数(例えば,重複指数A=0.05,ガウス成分比Γ'=0.05の場合は約700サンプル)から推定されるパラメータを用いた最適受信によっても,人工雑音環境下においても十分良好な誤り率特性が得られることを明らかにしている.

A Study on Man-Made Noise Elimination Technique for ISM-Band DS-SS Systems Using Multicode and Noise Observation Channel

UNAWONG Sakda, MIYAMOTO Shinichi, MORINAGA Norihiko

電気学会研究会資料. : The Papers of Technical Meeting on Electromagnetic Theory, IEE Japan. EMT, 電磁界理論研究会   1999 ( 55 ) 11 - 18   1999.08

A Study on Hybrid Line-of-Sight Indoor Infrared Wireless Communication System with Overlapping Zone Construction

MOCHINAGA Kazuhiro, MIYAMOTO Shinichi, HIROHASHI Kazutoshi, MORINAGA Norihiko

Technical report of IEICE. RCS ( The Institute of Electronics, Information and Communication Engineers )  99 ( 220 ) 79 - 84   1999.07

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As an indoor infrared wireless communication system, a multiple zone construction system has been taking a great attention as it achieves high spectrum efficient indoor wireless communication. In a conventional multiple zone system, since the multiple zones must be arranged without receiving interference lights from adjacent satellites, the whole room cannot be covered by infrared wireless communication system. In order to cover the whole room with coverage, however, overlapping zone construction may be applied despite a bad influence of the interference light. In this case, if the terminals are oriented to a satellite, the effects of the interference light decreases. Moreover, as terminals on overlapping zone can select a desired satellite from among accessible satellites, we can expect the improvement of the throughput performance and tolerance to shadowing. In this paper, we propose overlapping zone construction for line-of-sight indoor infrared wireless communication system and show that the performance of packet error rate and throughput can be much improved by using the proposed system.

A Study on the CNR Estimation under Man-made Noise Environment and Application to Improvement of Digital Radio Communications System with Sector Antenna

TOU Shinpei, MIYAMOTO Shinichi, MORINAGA Norihiko

Technical report of IEICE. RCS ( The Institute of Electronics, Information and Communication Engineers )  99 ( 220 ) 1 - 6   1999.07

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It is well-known that man-made noise emitted from ISM apparatus is one of the major causes of errors in ISM-band wireless local area network (LAN) systems. In general, man-made noise is not always emitted from ISM apparatus and the emission level of man-made noise is considered to vary with time. Therefore, in order to improve the performance of ISM-band wireless LAN system, the noise emission level is adaptively estimated by the wireless communication system. Carrier to noise power ratio (CNR) is the most basic parameter characterizing man-made noise and it will be widely applied to several countermeasures against man-made noise. In this paper, we discuss the CNR estimation in ISM-band wireless LAN under man-made noise environment and evaluate the bit error rate performance using sector antenna with the CNR estimation.

B-4-68 A Study on the Effect of Antenna Pattern on the Performance of Man-made Noise Reduction Technique using Sector Antenna

YOSHIZAWA Kensuke, MIYAMOTO Shinichi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers )  1999 ( 1 ) 349 - 349   1999.03

B-5-274 A Study on CNR Estimation under Man-made Noise Environment and Application to Noise Reduction Technique using Sector Antenna

TOU Shinpei, MIYAMOTO Shinichi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers )  1999 ( 1 ) 625 - 625   1999.03

B-5-265 A Study on the Performance of Non-directed Diffuse Indoor Infrared Wireless Communication System using PPM/CDMA

YAMANE Takahiro, MIYAMOTO Shinichi, MORINAGA Norihiko

Proceedings of the IEICE General Conference ( The Institute of Electronics, Information and Communication Engineers )  1999 ( 1 ) 616 - 616   1999.03